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Confused - easily done :) Assume you mean 0.45m³/hr.? If so, point taken - the UPS2 50/60 is not a terrible match for this if run in fixed speed mode, but develops far too little head in PP mode - the two modes are very far apart at lower flow rates, whereas the 80 series have the two modes...

The UPS2 15-50/60 shown on your attachment page 11 gives a head of about 1.75m at 0.7cu m/hr on PP3. Your desired working point shown in your previous graph was 1.8m head at 0.7 cu m/hr. Surely this is quite close to what you want? Though if you have a differential pressure bypass fitted, my...

Hannibal, Your neighbours, by law, will have contact details for the owner of the property, even if just the address. So contacting the owners could be an option. That said, I know where you are coming from. Party anything can very well be a PITA. I made the mistake of allowing a neighbour...

Hi hardwork - I don't know how many registered gas installers would want to modify a boiler's internal circuitry, but I like your way of thinking. It's only by experiment that we ever get any sort of progress! Not convinced by your economic argument on new boiler though. A decent modern...

Steelmasons - why is this tosh? In reply to hard-work: the system is balanced, subject to debate as in my original post, but consensus seems to be that it is balanced. Funny that you should mention option 2: a thermal store is actually part of a long-term plan that involves a woodburning...

In what way do they not make sense? The explanation I had from Grundfos was that since the primaries were always a part of the circuit and the head loss through the primaries would increase with flow, it therefore makes sense to INCREASE the head as the flow increases. So as radiator/zone...

Thanks D. Sounds like I'm trying to be a perfectionist for nothing then. Sounds like consensus is that provided there are no flow issues to the radiators with the greatest head loss, all is well then. In this case, the pump is not the problem - it is that the boiler flow temperature...

I don't think your walls have any architectural merit, so the only thing you're risking is that the foundations are not sufficient and they start to lean, or that they snap off at the base and then you get the opportunity to start from scratch anyway. But, given that on one side you'll only be...

Cheers John. You've hit the nail on the head: what is the 11° all about? I'd argue that the comfortable temperature of rooms is dictated by radiator sizing and the use of TRVs, but that balancing the radiators is the separate issue of ensuring they receive the exact flow they require to be...

I wonder what the old timers have to say on this issue. Whenever I try to balance radiators heated by old cast-iron boilers, I'm trying to attain the mythical 11°C across the radiator. In practice, this seems to be a search for the holy grail because the boiler is invariably running at below...

Would be good to see the outlet opposite the inlet to promote circulation of contents. Otherwise looks perfectly okay as far as I can see.

Interesting that people have had bad experiences with this. I'm currently in the middle of laying my own floors with some rooms reclaimed (from my own house) and some rooms new boards all over UFH based on the fact that a friend of mine did the same thing on his house. 'Did it work?' I asked...

The other question is, what about the white fence installed in June 2014? Actually, I'm not happy with the white fence at all. Some of the pickets weren't primed with the right brand of oil, but ALL the pickets are mouldy - just different colours of mould. 15% zinc oxide was mixed into the...

February 2016: So what's new? The dark green gloss (now 4 years and 5 months old) is starting to show signs of failure where it was applied over previous paint, but still working perfectly where it is on a sound surface. Small hairline cracks have appeared in the gloss. The grey Bedec Barn...

FOR FUTURE REFERENCE Inch and a quarter solvent weld pipe (PVC or ABS) tends to have a 36mm O/D. PP push fit pipe is more like 34mm OD but we still call it inch and a quarter, and I note OSMA still stamps its pipe in imperial measurements. This is handy, because PP will not solvent weld...

Hi, can you tell me what you mean by a yellow brick please? I assume that's electrician's slang?

This is for my mother's house shortly up for sale. Buyer wants new washbasins fitted in rooms that are currently toilet only and she's foolishly agreed to get it done for him :roll: One toilet has horizontal branch of iron soil stack, the other toilet is plumbed into (presumably) clay drain...

To be frank, I wonder how truthful the claim is that PVC windows fall apart really is. In a sun-trap, my own ones have served since (I believe) 1990, so that is 25 years. They are showing their age, but could probably be refurbished if the sill end-caps were available. And, although A+...

Having looked again at the OP's post date, I'd hope this matter were now settled. But thanks for that link. Though the windows might not compete environmentally (depending on how long they last), they look dead good from what I can can see. Can you get them in other colours, or only...

Right behind you Dan. Was actually thinking of roughly painting over them with some green paint so they looked cared for without looking new. Heard a good one from a customer today, 'And there was a plumber, well, I think he was, he had paint on his clothes.' :lol: Though actually my...